All pain problems are connected to a blockage in the nerve distribution and therefore you should consider to get your spine and joints into its best aligned position.

 Your condition is most likely a form of sciatica.

I suggest to do the Dorn Method Self Help Exercises together with the avoidance of possible causes for a least two month to allow your body to heal.

Beside that massage your deeper buttocks muscles several times a day for a minute at a time to decrease the pressure onto the sciatic nerve. 

All necessary information you find at: www.dorn-method.com